could heterodyne
Regular verb: heterodyne - heterodyned- heterodyned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could heterodyne
you could heterodyne
he could heterodyne
we could heterodyne
you could heterodyne
they could heterodyne 	I could be heterodyning
you could be heterodyning
he could be heterodyning
we could be heterodyning
you could be heterodyning
they could be heterodyning	I could have heterodyned
you could have heterodyned
he could have heterodyned
we could have heterodyned
you could have heterodyned
they could have heterodyned	I could have been heterodyning
you could have been heterodyning
he could have been heterodyning
we could have been heterodyning
you could have been heterodyning
they could have been heterodyning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't heterodyne
you couldn't heterodyne
he couldn't heterodyne
we couldn't heterodyne
you couldn't heterodyne
they couldn't heterodyne 	I couldn't be heterodyning
you couldn't be heterodyning
he couldn't be heterodyning
we couldn't be heterodyning
you couldn't be heterodyning
they couldn't be heterodyning	I couldn't have heterodyned
you couldn't have heterodyned
he couldn't have heterodyned
we couldn't have heterodyned
you couldn't have heterodyned
they couldn't have heterodyned	I couldn't have been heterodyning
you couldn't have been heterodyning
he couldn't have been heterodyning
we couldn't have been heterodyning
you couldn't have been heterodyning
they couldn't have been heterodyning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I heterodyne?
could you heterodyne?
could he heterodyne?
could we heterodyne?
could you heterodyne?
could they heterodyne? 	could I be heterodyning?
could you be heterodyning?
could he be heterodyning?
could we be heterodyning?
could you be heterodyning?
could they be heterodyning? 	could I have heterodyned?
could you have heterodyned?
could he have heterodyned?
could we have heterodyned?
could you have heterodyned?
could they have heterodyned? 	could I have been heterodyning?
could you have been heterodyning?
could he have been heterodyning?
could we have been heterodyning?
could you have been heterodyning?
could they have been heterodyning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I heterodyne?
couldn't you heterodyne?
couldn't he heterodyne?
couldn't we heterodyne?
couldn't you heterodyne?
couldn't they heterodyne? 	couldn't I be heterodyning?
couldn't you be heterodyning?
couldn't he be heterodyning?
couldn't we be heterodyning?
couldn't you be heterodyning?
couldn't they be heterodyning? 	couldn't I have heterodyned?
couldn't you have heterodyned?
couldn't he have heterodyned?
couldn't we have heterodyned?
couldn't you have heterodyned?
couldn't they have heterodyned? 	couldn't I have been heterodyning?
couldn't you have been heterodyning?
couldn't he have been heterodyning?
couldn't we have been heterodyning?
couldn't you have been heterodyning?
couldn't they have been heterodyning?